What is the fuel consumption of a Class 8 truck engine at idle?

Answer: C — 4 litres of fuel per hour at 900 RPM

The fuel consumption of a Class 8 truck engine at idle is typically around 4 litres of fuel per hour at 900 RPM. This figure reflects the amount of fuel the engine uses when it is running without load, which is often necessary for maintaining various functions such as the electrical system, air conditioning, and other accessories that might be operating while the truck is stationary. When engines are idling, the fuel consumption can vary based on model, engine type, and additional load such as air conditioning. However, 4 litres at this RPM is a common average for larger truck engines, providing a standard that helps drivers calculate idle times and manage fuel efficiency effectively. Other options indicate lower or higher consumption rates, which may not align with industry standards for Class 8 trucks known for their larger engines and complex systems requiring higher fuel usage during idle conditions. Understanding this benchmark helps drivers realize the importance of minimizing idle time to improve overall fuel efficiency and reduce emissions.